PHP
$values = ['ä', 'ö', 'ü'];
echo json_encode($values);
// ["\u00e4","\u00f6","\u00fc"]
echo json_encode($values, JSON_UNESCAPED_UNICODE);
// ["ä","ö","ü"]
Umlaute bei json_encode() werden zu \u00e4 statt ä
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